Sheet cutting tool



March 1953 H. HEDSTROM SHEET CUTTING TOOL Filed Sept. 10, 1951 IN V EN TOR. Ham/z fielszwm Patented Mar. 31 1953 2 UNITED STATES ATENT' OFFICE SHEET CUTTING TOOL Harold Hedstrom, Denville, N. J.

Application September 10, 1951, Serial No. 245,880

" l Claims. (01. 30-241) 7 This invention relates to a tool for cuttin sheet material of various typesand kinds and, particularly, sheet metal. More particularly, the

invention deals with a tool of this type and kind which is generally characterized as a nibbling tool, wherein a punch 'is reciprocated at high speed inxthe direction of a die in the operation of .cutting, trimming or'otherwise shaping sheet material; of various types and kinds. Still more particularly, the invention deals with a tool of the character described, having a readily attachable and adjustable to'olhead, so that the tool stock adjacent the reciprocating punch can be disposed in'difierent angular positions to adapt the tool for many'uses.

-=The novel features of the invention will be best understood-from the following description, when taken together with the accompanying drawin "in which certain embodiments of the invention are disclosed and, in which, the separate parts are designated by suitable reference characters in each of the views and, in which:

Fig.1 is a face view of a tool made according to myinvention, showing the cover plate removed and illustrating parts in an extended position for adjustment thereof.

Fig.2 is a section on the line 2-2 of Fig. 1, showing the parts in assembled position. 7

- Fig. 3 is a bottom planand sectional view of the lower head portion only of the tool; and Fig. 4 is a section on the line 44 of Fig. 2.

I In'Figsfl and 2 of the drawing, I have shown at In the casingbf my improved tool, which has V casing it! is open at its front end, as seen at, [6

for reception of acove jnot.shown, the cover giving access to a chamber ll, in which the mechanism of the tool is operated.

. "The casin I!) has a downwardly directed bear ing extension l8; having a plain bore l9 for the reception of a tool head 20. The head is in the form ,of a tubular body, having a threaded upper end portion2l, slidablein the bore IQ of thelbearing l 8 the upper portion of the head "zn'beingcut-away to form a square key member 22 adapted to receive a'key 23;

It will be noted from a consideration of Fig. l of the drawing that the bore [9 is milled at opposite sides 25 tq form aykey recess; in which the key element23 is adapted to seat, inorder to retain the head 20 in" one of fOurdifferent positions of adjustment, the latter beirigf'bontrolled by the square key-member 22; Engaging the threaded pdrtioni2l is a lock sleevenu't 25, whichhas 'a sleeve portionw2li enveloping and guiding the lower 1 enlarged portion 21 of the head 20a The head 20 has a large diameter bore 28' and a smaller diameter bore 29, which opens into a flared workpiece receiving groove or throat 30 formed between the body 4! and the lower punch die end 3| of the head. The die end 3| has a bore 32, common in diameter with the bore 29. and this bore formsthe die orifice, into which the reciprocating cutter or punch 33 is adapted to pass. The bore 32 opens into a larger diameter discharge passage 34, into whichthe lower reduced end 35 of the punch 33 passes, I

The die end 3! is materially reduced in width, as compared to the body 21, as will appear from a consideration of Fig. 3 of the drawing and is contracted to one side of the body 21, as seen at 36. ,The die end-3| joins the body 2'! in a narrow tapered fin or web 31, which is disposed centrally and longitudinally of the die 3|.

The punch 33 has "a large diameter portion 38, which fits snugly in the bore 28 and guides the punch in. the operation thereof. The upper end of the punch has a round disc-like head 39, which has a rotatable bearing in a socket of a drive 7 disc 4!, the lower portion of the disc M, adjacent the head39, being cut-away, as seen at 42.

Eccentrically disposed on the drive disc 4! is a drive pin 43 in the form of a screw, which is in threaded engagement with either one of two threaded apertures '44, 45 of the eccentric I4. The threaded apertures 44, 45 are eccentrically disposed with respect to the axis of the shaft portion l3, the aperture 44 being arranged closer to the axis than is the aperture 45, thus, in coupling the drive pin 43 with the respective apertures,'the stroke of the punch 33 canbe modified.

In adjusting the head 20, it will be apparent that the nut 2 5 is loosened and lowered sufliciently by the clearance 46; which is provided to enable the head .to be pushed upwardly into the casing l0, so as to free the key 23 from the key groove defined by' the surfaces 24 and facilitate the rotation of tl' iehead," so as to position the web 3i in" anyone of four different"circumferential positions, thus adapting the'tool to the performance of different cutting operations, orto' suit the workpieces operated'upon, as will be apparent. Considering Fig. 4 of the drawing, it will appear thatthe key,-or key element, 23 is in the form of a U shaped member, which fits snugly in the recess, which forms the square key portion 22. The crossfhead 23" of the key 23, as seen in Fig. 1,' is directed outwardly with respect to the opening l6 and preferably has bevelled or rounded corners-so as to facilitate rotary movement of thekey 23 within the chamber ll of the casing; when the key 23 ismoved out of engagement "with the key shoulders 24, as above described.

into the casing through the bore I9 with the nut" in its lowered position. This willzexposethe recess, having the square key portion 22 through the opening it and the key 2 3rcan then' be placed in position by hand, after which, the head with the key 23 thereon is lowered into the key recess formed by the shoulders 24 and, the nut 25 is tightened; In thislast' operation, it-will be understood that the head 29' willbe-adjusted to dispose the web 3-? in-the desired direction, or rather to expose the workpiece recess SU in the position desired with respect to thetool. It will. be understood that the drive to the spindle !5 may be through the medium of a flexibleshaft or any other drive, depending upon the-use of the tool;

It will beapparent that; the rotationof the eccentric or member I4, thedrivedisc M is given a rotary-reciprocatingmotionwhich, in turn, operates the-punch -33 the'head 39" of the punch having an oscillatingmovement in the discin this operation.

From timeto' time,- it' will benecessary to replace the punch and this can be accomplished by removing the'headunit-FZB andslipping the head 39'0f the-'punchout' of. the disc andpassing it down to thebore ll By 'virtueof the-adjustability 'of the headunit, my improved. nibbling'toolcan be'rutilized "to: cut sheet material? haying; irregular' contourssuch, for example, as corrugated.sheeirmaterial without any appreciable. *distordaionrto. the. sheet:

Having fully described:.my. inventiomwhat I claim as new=and desiregto-secure by Letters Batent is:

1. A nibblingtool, comprisingga .casing; ashaft rotatably mounted: in; the casing and having a coupling" end-t protruding therefrom, theshaft haying, within thezcasing, aneccentridmember, a

drive;- disc adjustably coupled: witlnsaid; member in control: of the-.--drive;-thereof, saididisc. having a. socket. opening: through theperiphery and through opposed side surfaces thereof, a head unit-'detachably mountedin the: lowerrportion of the casing and projectingtherefrom, a punch mounted in said: unit, said punchrhavinggadisc headpivotallymountedinsaid :socket, said unit having; at the lower portion; thereof; adie .into which: said, punchi is. adapted to. pass:,, and; said unit adjacent-the .-die;bei-ng recessedifor. the. reception of a; workpiece. to-bes engaged. by the punch in. the; operation of: seyering the-workplece;

2. A nibbling tool; comprising a. casing;, a-;shaft rotatably mounted in the casing and ha-V-inga coupling; and protruding; therefrom the: shaft having, withini the casing,;,,an .eccentric.;member,

drive disc. adjustably'coupled.withisaid' member in;controLof-the.difiveathereohsaiddisc; having a. socket opening thronghthe-periphery and through: opposed: side. surfaces thereof,v a; head unit detachably; mounted intheslowerz portion of .thecasing; and; projecting; therefrom, a punch mounted in said-unit, said-punch. having. a.- disc head .pivotally mounted in said-socket; said unit having; at thev lower: portion. thereof, a die into which said punch is adapted to pass, said. unit adjacent the die being recessed for the reception of a workpiece to be engaged by the punch in the operation of severing the workpiece, said die joining the head-rat saidgrecesswin afin-like web, saidihead unit being rotatably; adjustable in said casing, said rotatable adjustment comprising a key mounted on the unit, a keyway in the casing engaged by said key, and a nut in threaded engagement with the unit for securely clamping the unit=on thecasing 3. A nibbling tool, comprising a casing, a purcnzdrivemmeans in the casing for recipro eating. said punch, a cylindrical head mounted in thecasing and in which said punch reciprocates, said head having a die at its lower end, intowhich the-punch passes; the die joining the head in a-"fin-lik e web forming a large workpiece receiving'recess around-theenajor portion of the punch, means adjustably supporting the head in said'casing to arrange said web in a number of different'circumferential positions in the operatiionofTthetool, the-front'of" the casing being open, .acover closing saidcasing front, the inner end'ofthe head having a recessed key portion accessible through the casing opening, and a key insertab'le into; said" recess through the casing openingin detachably'supportingthe head in said: casing:

4 ..A.. nibbling: tool, comprising a. casing, a punch, driven meansrinthe casing for'reciproeating punch; a cylindrical head mounted irhthe; casing-and". in which. said. punch reciprocates; saidiheadihaying an die:- at itst lower end, into;wh-ich.thezpunch: passes, the. die joining the headzirr a-cfinslikeewehforming"aslarge workpiece receiving recess":aroundthamajor;portion of the punch, meansi adjustably; supporting the head in said casing-to. arrangesaid web; in a number of diiferent ciroumferentia'lrpositions" in the operation: of the:tool-,- the; front of. the casing being open, a cover closing-saidicasing; front, the inner endof the head=-ha-ying-a recessed key portion accessible throughthe casing opening, a key insertable'into sa-id recess-through thecasing opening in detachablysupporting the head in said casing, saidkeyfittinga ,key-way in the casing inadjustable sup-portof the head, and a sleeve nut adjustable. on-the: head-to. control adjustable securing and detachment-of the head with respect to:said;casing.

A nibbling tool, comprising a casing, a driven shaft rotatable inthe casing and having means projecting.trom-thecasingfor coupling withv a suitable drive, an; eccentric member on saidshaft within. the casing,.the lower portion of, the casing having-means. forguiding a punch, said last named means, including,,.at its lower end,..a die, in connection-with whichsaid punch operates, adri-vedisc,.withwhich theupper end of theep unchisemovably coupled, said member having, a pair.ofLthreadedapertures eccentrically disposed thereon, andfa, threaded. pin eccentrically disposedion. saidi disc and adapted. to. be positionedinoneiofsaid apertures in control of the operation of 'saidcplmch.

HAROLD" HEDS'IROM.

REFERENCES CITED- The, following, references are of record in the file ofthis patent:

UNITED, STATES PATENTS 

